Search Results for author: Kevin Heng

Found 5 papers, 3 papers with code

Intercomparison of Brown Dwarf Model Grids and Atmospheric Retrieval Using Machine Learning

no code implementations12 May 2023 Anna Lueber, Daniel Kitzmann, Chloe E. Fisher, Brendan P. Bowler, Adam J. Burgasser, Mark Marley, Kevin Heng

Understanding differences between sub-stellar spectral data and models has proven to be a major challenge, especially for self-consistent model grids that are necessary for a thorough investigation of brown dwarf atmospheres.

Retrieval

Retrieval analysis of 38 WFC3 transmission spectra and resolution of the normalisation degeneracy

2 code implementations18 Sep 2018 Chloe Fisher, Kevin Heng

A comprehensive analysis of 38 previously published Wide Field Camera 3 (WFC3) transmission spectra is performed using a hierarchy of nested-sampling retrievals: with versus without clouds, grey versus non-grey clouds, isothermal versus non-isothermal transit chords and with water, hydrogen cyanide and/or ammonia.

Earth and Planetary Astrophysics Atmospheric and Oceanic Physics Data Analysis, Statistics and Probability

Supervised Machine Learning for Analysing Spectra of Exoplanetary Atmospheres

1 code implementation11 Jun 2018 Pablo Marquez-Neila, Chloe Fisher, Raphael Sznitman, Kevin Heng

Machine learning has previously been used to determine which molecules to include in the model, but the retrieval itself was still performed using standard methods.

Earth and Planetary Astrophysics Atmospheric and Oceanic Physics Data Analysis, Statistics and Probability

The theory of transmission spectra revisited: a semi-analytical method for interpreting WFC3 data and an unresolved challenge

no code implementations7 Feb 2017 Kevin Heng, Daniel Kitzmann

Second, we show that the transmission spectra of isothermal atmospheres are nearly isobaric.

Earth and Planetary Astrophysics Atmospheric and Oceanic Physics

VULCAN: an Open-Source, Validated Chemical Kinetics Python Code for Exoplanetary Atmospheres

2 code implementations1 Jul 2016 Shang-Min Tsai, James R. Lyons, Luc Grosheintz, Paul B. Rimmer, Daniel Kitzmann, Kevin Heng

It is constructed for gaseous chemistry from 500 to 2500 K using a reduced C-H-O chemical network with about 300 reactions.

Earth and Planetary Astrophysics

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